linux-kernel - Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs

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Message-ID: <20160314162602.GA24203@intel.com>
Date:	Mon, 14 Mar 2016 18:26:02 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, jgunthorpe@...idianresearch.com,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple
 emulated TPMs

On Sun, Mar 13, 2016 at 06:54:38PM -0400, Stefan Berger wrote:
> This patch implements a proxy driver for supporting multiple emulated TPMs
> in a system.
> 
> The driver implements a device /dev/vtpmx that is used to created
> a client device pair /dev/tpmX (e.g., /dev/tpm10) and a server side that
> is accessed using a file descriptor returned by an ioctl.
> The device /dev/tpmX is the usual TPM device created by the core TPM
> driver. Applications or kernel subsystems can send TPM commands to it
> and the corresponding server-side file descriptor receives these
> commands and delivers them to an emulated TPM.

Tested-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

My testing procedure was:

* Wine running TPM 2.0 simulator on the host side. [1]
* QEMU running an OS image with this patch. [2]
* Wrote a script for proxying the simulator: tpm2-simulator-vtpm. [3]
* Run some smoke tests: python -m unittest -v tpm2_smoke. [3]

[1] http://research.microsoft.com/en-us/downloads/35116857-e544-4003-8e7b-584182dc6833/
[2] git://git.infradead.org/users/jjs/buildroot-tpmdd.git
[3] git://git.infradead.org/users/jjs/tpm2-scripts.git

/Jarkko

> Signed-off-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
> CC: linux-kernel@...r.kernel.org
> CC: linux-doc@...r.kernel.org
> CC: linux-api@...r.kernel.org
> ---
>  drivers/char/tpm/Kconfig          |  10 +
>  drivers/char/tpm/Makefile         |   1 +
>  drivers/char/tpm/tpm_vtpm_proxy.c | 572 ++++++++++++++++++++++++++++++++++++++
>  include/uapi/linux/Kbuild         |   1 +
>  include/uapi/linux/vtpm_proxy.h   |  42 +++
>  5 files changed, 626 insertions(+)
>  create mode 100644 drivers/char/tpm/tpm_vtpm_proxy.c
>  create mode 100644 include/uapi/linux/vtpm_proxy.h

/Jarkko